Yes zhang, I have tried it and also a lot of incoming spams were received and sent.
Is there a way to just whitelist a sender?
The error is this:
Jul 17 09:50:41 mail postfix/smtpd[32294]: connect from unknown[202.x.x.x]
Jul 17 09:50:41 mail postfix/smtpd[32294]: NOQUEUE: reject: RCPT from unknown[202.x.x.x]: 553 5.7.1 <customercare@7-eleven.com.ph>: Sender address rejected: not owned by user customercare@7-eleven.com.ph; from=<customercare@7-eleven.com.ph> to=<zms_15@yahoo.com> proto=ESMTP helo=<prod-sevenpay.apollo.com.ph>
Jul 17 09:50:41 mail postfix/smtpd[32294]: disconnect from unknown[202.x.x.x]
Jul 17 09:50:48 mail postfix/smtpd[32287]: connect from unknown[202.x.x.x]
Jul 17 09:50:48 mail postfix/smtpd[32287]: NOQUEUE: reject: RCPT from unknown[202.x.x.x]: 553 5.7.1 <customercare@7-eleven.com.ph>: Sender address rejected: not owned by user customercare@7-eleven.com.ph; from=<customercare@7-eleven.com.ph> to=<jonabel_alpanta@yahoo.com> proto=ESMTP helo=<prod-sevenpay.apollo.com.ph>
Jul 17 09:50:48 mail postfix/smtpd[32287]: disconnect from unknown[202.x.x.x]
If the 'reject_sender_login_mismatch' is removed, these messages will pass, but if the it is enabled, that is the error that shows.